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In the context of interference channels with multiple transmitters and receivers, we propose a novel decoding scheme called anywhere decoding that does not pre-assign the receiver at which each message should be decoded, but rather requires that each message must be decoded at some receiver. This paper illustrates how system performance can improve if we allow for this flexibility. After developing...
The list demapper has been widely employed for coded multiple-input multiple-output (coded-MIMO) receivers, where only a list of signal vectors is examined in the calculation of likelihood ratio. In the literature, the search of list is operated in the symbol level in accordance with a search metric defined as a function of signal (symbol) vector. Since a signal vector is mapped from a group of (coded)...
The preamble is one of the indispensable signals in order to discriminate the desired signal from the others. The pseudo-noise (PN) sequences can be used as a part of preamble because of its outstanding correlation properties. One of good preamble detection algorithms for PN sequence is an improved composite pseudo-noise correlation (ICPC) method. In this paper, we focus on the analysis of the probability...
Over the last decade short-range communications in the terahertz band have been extensively studied as a technology-enabler for dense and ultra-dense wireless networks. Recent advances in miniaturized terahertz transceivers design promise wireless connectivity and simultaneous interaction between thousands of devices. However, the feasibility of network-wide communications is still an open issue due...
NASA Glenn Research Center (GRC) and the Politecnico di Milano (POLIMI) have initiated a joint propagation campaign within the framework of the Alphasat propagation experiment to characterize rain attenuation, scintillation, and gaseous absorption effects of the atmosphere in the 40 GHz band. NASA GRC has developed and installed a K/Q-band (20/40 GHz) beacon receiver at the POLIMI campus in Milan,...
this paper focuses on the study of electric field spatial variability in the context of mobile telephony base stations exposure. Electric field is computed using a Uniform Theory of Diffraction (UTD) based simulation technique suitable for large urban areas. Two complementary approaches of spatial variability are proposed here. One based upon spatial autocorrelation and the other one on statistical...
Forests are typical scenarios for rescue and emergency actions, in which peer-to-peer radio communication systems emerge as good solutions to maintain the crewmembers connected and to coordinate the complete operation. However, the radio links in such complex environment suffers strong fading events. Implementing spatial diversity at reception would improve the connectivity in such situations, as...
Car-to-car (C2C) communications requires reliable connectivity at moderate data rates. This is essential for safety-related applications. The development of such communication systems needs to cope with time-variant propagation channels and rich multipath environments. Moreover, the choice of the antennas and their position in/on the car highly influences the overall propagation channel. This paper...
Unmanned aerial vehicles (UAV) are widely used in civil applications nowadays and resulting photomaps, or aerial monitoring, demand an enormous amount of transmitted data in high frequency links. In the new generation of wireless communication standards, different propagation channel models are recommended for system simulations to develop new hardware. Every channel model needs to be validated by...
In this paper, measurements of vertically Polarized electromagnetic surface waves over a smooth sea in HF band have been compared with theoretical models. The theories are briefly explained, with an accurately description of the measurement process. Some differences have been pointed out between the Bourlier's rigorous method and Millington's empirical method according to the measurements.
The large bandwidth of ultra wideband (UWB) makes it attractive in high speed transmission applications. However, the possibility of frequency selectivity of the channel is high due to this bandwidth. Channel characterization is important to study the behavior of the channel. The ground reflection effects are important parameters affecting the ultra wideband channel. In this paper, based on outdoor...
In this paper, we study the downlink multiuser scheduling problem for systems with simultaneous wireless information and power transfer (SWIPT). We design optimal scheduling algorithms that maximize the long-term average system throughput under different fairness requirements, such as proportional fairness and equal throughput fairness. In particular, the algorithm designs are formulated as non-convex...
In HF (3–30 MHz) communications the ambient electromagnetic background noise or ‘radio noise’ generally is the limiting factor in reception. Radio noise measurements are needed for spectrum pollution control and to provide reference levels for radio system design. This article discusses the influence of the measurement antenna on the measurement results. A novel method to compare the polarization...
Concurrently executing diverse independent applications on a many-core processor with hundreds of cores requests allocating application tasks to minimize communication contention and communication cost. In this paper, we propose a novel application allocation algorithm to assign applications onto a many-core processor with considering communications between tasks and contentions on network channels...
Non-orthogonal multiple access (NOMA), which uses superposition coding at the transmitter side and successive interference cancellation at the receiver side, is a promising new downlink multiple access scheme. The product of user average throughputs among all users within a cell can be maximized by optimal proportional fair (PF) scheduling, but this is computationally complex because it requires an...
Recent advancements in graph-based analysis and solutions of instantly decodable network coding (IDNC) trigger the interest to extend them to more complicated opportunistic network coding (ONC) scenarios, with limited increase in complexity. In this paper, we design a simple IDNC-like graph model for a specific subclass of ONC, by introducing a more generalized definition of its vertices and the notion...
Resonant Inductive Coupling Wireless Power Transfer is a leading field of research due to the growing number of applications that can benefit from this technology: from biomedical implants to consumer electronics, fractionated spacecraft and electric vehicles, amongst others. However, applications are currently limited to point-to-point-links and do not target Single Input — Multiple Output (SIMO)...
Subtype polymorphism is a cornerstone of object-oriented programming. By hiding variability in behavior behind a uniform interface, polymorphism decouples clients from providers and thus enables genericity, modularity and extensibility. At the same time, however, it scatters the implementation of the behavior over multiple classes thus potentially hampering program comprehension. The extent to which...
It is well known that geometry is of significance to the performance of multistatic radars. In multistatic passive radars the receiver placement is especially critical since the transmitters of opportunity are beyond control of radar designer. Instead of considering a single objective, we suggest to implement the receiver placement by using multiobjective optimization in this paper. Specifically,...
This paper describes a novel approach to the problem of fading channels estimation. Specifically, the proposed system makes use of fuzzy logic in the computation of the metrics for an MLSE equaliser for GMSK signals in GSM typical environments. The comparison with the traditional Viterbi algorithm is performed using the channel models specified by ETSI and shows that the proposed system performs better...
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